OPTICAL COORDINATE INPUT DEVICE

摘要

PURPOSE:To transmit the coordinate signal exactly and at a high speed by fixing the coordinate signal at a prescribed level and holding the base potential of a bipolar transistor at a fixed level to the collector potential. CONSTITUTION:The voltage of a prescribed level is impressed to the base of a bipolar transistor TR52 by a switching signal Ss is a switch mode when the base is connected to an array of photodetecting elements. At the same time, the level of the coordinate signal applied to the base of the TR52 is fixed at a prescribed level by clamping means C1 and 54. While the base potential of the TR52 is kept at a fixed level to the collector potential by the discharging action of a diode 54.